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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <arch/ega.h> |
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| 30 | #include <putchar.h> |
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| 31 | #include <mm/page.h> |
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| 167 | jermar | 32 | #include <arch/mm/page.h> |
| 1 | jermar | 33 | #include <synch/spinlock.h> |
| 34 | #include <arch/types.h> |
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| 35 | #include <arch/asm.h> |
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| 195 | vana | 36 | #include <memstr.h> |
| 1 | jermar | 37 | |
| 38 | /* |
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| 39 | * The EGA driver. |
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| 40 | * Simple and short. Function for displaying characters and "scrolling". |
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| 41 | */ |
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| 42 | |||
| 43 | static spinlock_t egalock; |
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| 44 | static __u32 ega_cursor; |
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| 45 | |||
| 46 | void ega_move_cursor(void); |
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| 47 | |||
| 48 | void ega_init(void) |
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| 49 | { |
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| 50 | __u8 hi, lo; |
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| 51 | |||
| 492 | jermar | 52 | page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0); |
| 1 | jermar | 53 | outb(0x3d4,0xe); |
| 54 | hi = inb(0x3d5); |
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| 55 | outb(0x3d4,0xf); |
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| 56 | lo = inb(0x3d5); |
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| 57 | ega_cursor = (hi<<8)|lo; |
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| 58 | ega_putchar('\n'); |
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| 59 | } |
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| 60 | |||
| 452 | decky | 61 | static void ega_display_char(char ch) |
| 1 | jermar | 62 | { |
| 106 | jermar | 63 | __u8 *vram = (__u8 *) PA2KA(VIDEORAM); |
| 1 | jermar | 64 | |
| 65 | vram[ega_cursor*2] = ch; |
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| 66 | } |
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| 67 | |||
| 68 | /* |
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| 69 | * This function takes care of scrolling. |
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| 70 | */ |
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| 452 | decky | 71 | static void ega_check_cursor(void) |
| 1 | jermar | 72 | { |
| 73 | if (ega_cursor < SCREEN) |
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| 125 | jermar | 74 | return; |
| 1 | jermar | 75 | |
| 205 | jermar | 76 | memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2); |
| 106 | jermar | 77 | memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720); |
| 1 | jermar | 78 | ega_cursor = ega_cursor - ROW; |
| 79 | } |
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| 80 | |||
| 63 | decky | 81 | void ega_putchar(const char ch) |
| 1 | jermar | 82 | { |
| 413 | jermar | 83 | ipl_t ipl; |
| 1 | jermar | 84 | |
| 413 | jermar | 85 | ipl = interrupts_disable(); |
| 1 | jermar | 86 | spinlock_lock(&egalock); |
| 87 | |||
| 88 | switch (ch) { |
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| 89 | case '\n': |
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| 125 | jermar | 90 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
| 91 | break; |
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| 1 | jermar | 92 | case '\t': |
| 125 | jermar | 93 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
| 94 | break; |
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| 1 | jermar | 95 | default: |
| 125 | jermar | 96 | ega_display_char(ch); |
| 97 | ega_cursor++; |
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| 98 | break; |
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| 1 | jermar | 99 | } |
| 100 | ega_check_cursor(); |
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| 101 | ega_move_cursor(); |
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| 125 | jermar | 102 | |
| 1 | jermar | 103 | spinlock_unlock(&egalock); |
| 413 | jermar | 104 | interrupts_restore(ipl); |
| 1 | jermar | 105 | } |
| 106 | |||
| 107 | void ega_move_cursor(void) |
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| 108 | { |
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| 109 | outb(0x3d4,0xe); |
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| 110 | outb(0x3d5,(ega_cursor>>8)&0xff); |
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| 111 | outb(0x3d4,0xf); |
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| 112 | outb(0x3d5,ega_cursor&0xff); |
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| 113 | } |
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| 114 | |||
| 63 | decky | 115 | void putchar(const char ch) |
| 1 | jermar | 116 | { |
| 117 | ega_putchar(ch); |
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| 118 | } |